How can I end the function causing the part to follow my mouse?

I can't think of a solution to stopping this:

local plr = game.Players.LocalPlayer
local m = plr:GetMouse()

game:GetService("RunService").RenderStepped:connect(function()
    local bob = workspace.Bob
    if bob then
        bob.Position = m.Hit.p
        m.TargetFilter = bob

        m.Button1Down:connect(function()
            --?? What would stop the above
        end)
    end
end)

I tried changing the conditions to the "if bob then" for a loop but that did nothing.